RE: ISP outbound SMTP filtering

Except I have valid PTR records, I'm registered as a mail server and I
have a static IP.

-----Original Message-----
From: [email protected] [mailto:[email protected]]
On Behalf Of Scott Weeks
Sent: Wednesday, June 06, 2007 3:35 PM
To: [email protected]
Subject: RE: ISP outbound SMTP filtering



--- [email protected] wrote:
From: "Blake Pfankuch" <[email protected]>

> I have found only one legitimate use of a mail server on 
> a DHCP assigned address, so far, and I suspect there're 
> very, very few folks doing that.  So, block outbound 25 
> on DHCP ranges.

: Most higher end spam filtering services already flag dhcp 
: ranges as more likely to be spam.  When I first started 
: running my own mail server, it was a static in an area 
: according to the ip whois of a dhcp range.  I couldn't 
: send to anyone on rr.com or numberous other domains until 
: they fixed that.


A filter looking for legitimate port 25 connections would've found you,
though.  First set up the filter/*nix program to look for "legitimate"
email servers, then block on dynamic ranges and then move on from there.

scott
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_______________________________________________
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